Now I remember! I thought it was because...
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The One Sith weren't the "true" Sith. If Darth Bane tells Krayt that he is a punk for not following the rule of two and Ship won't listen to them, as shown in one of the early FOTJ books, then the Sith Hounds wouldn't either.
Maybe Vile is right and they weren't there, or maybe that is a possible explanation for what is happening. I just assumed that was the case and didn't consider that they might not have actually been there. [/quote]